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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2759ac2062b85789618335d1d85a03a1c6e7d6aba8d0d0ca7fb195a480b4e396' 
  AND token = 'LWAH9ik4S6iPp74JPOjpu+NwPROPmndbicLITBCG7u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}